Mold and apparatus for making u-packing



w T. cnossm. MOLD AND APPARATUS FOR MAKING U-PACKING.

APPLICATION HLED FEB. 10, 1920.

1,386,602. Patented Aug. 9,1921.

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W Qfl "X ATTORNEY T. CROSSETT.

MOLD AND APPARATUS FOR MAKING U-PACKING.

APPLICATION FILED FEB. 10, 1920.

PatentedAug. 9, 1921.

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THOMAS CROSSE'I'T, OF NEW YORK, N. Y.

Original application filed May 29, 1919, Serial No. 300,652. Divided and this 10, 1920. Serial No. 357,655.

To all whom'it may concern:

Be it known that I, THOMAS CRossETT, a citizen of the United States, and resident of New York city, in the county of Kings and State of New York, have invented certain new and useful Improvements in Molds and Apparatus for'Making U-Packing, of which the following is a specification.

This application is a division of my application for patent for method of making U-packing and mold therefor, filed May 29, 1919, Serial N 0. 300,652, wherein I have set forth an improved method of making U-packing and a mold for making such pack: mg.

@ Heretofore, so far as I am aware, U-

packings have been made by means of a two-part die, one part of which has an annular groove and the other part has an annular projection to force a corresponding portion of a disk of leather into said groove, leaving an intermediate portion of the disk to be cut out. Such forcing of the leather necessarily stretches the parts thereof that enter the groove to such an extent as to injure the leather with consequent weakening of it, whereby the U-packing so formed will crack in places and wear out quickly and will permit leakage at the joint the packing is intended to make tight. Another disadvantage is that the aforesaid stretching'of' the leather has the effect to make the packing thinner at the bottom of its U-groove than at the sides, rendering the packing weakest at the bottom of the U-groove where it should be the strongest.

The object of my invention is to provide improved means to produce U-packing without stretching the material thereof into a groove in a die and without injuring the material.

My present invention embodies the aforesaid mold comprising an inner member and two separate concentric rings of different diameter which fit within one another and around the inner member whereby the packing material may be folded between said member and the inner ring and between the two rings to form said material in U-shape for the packing. My invention also embodies means to support and operate the mold members for folding the material to produce the U-packing.

Reference is had to the accompanying drawings forming part hereof wherein- Specification of Letters Patent.

Patented Aug. 9, 1921.

application filed February Figure 1 is a central sectional view illustrating the mold members assembled in the first step in folding the material for the packing;

Fig. 2 is a similar'section illustrating the mold members in position ready for final folding of the material;

Fig. 3 illustrates the parts of the mold or die assembled and the material therein folded in U shape;

F ig. 4 is an edge view of the folded material;

Fig. 5 is a cross section of Fig. 4;

Fig. 6 is a partly sectional view illustrating my improved mold packing;

Fig. 7 is a plan view of the three concentric parts of the mold;

Fig. 8 is a vertical section of my improved apparatus with the mold members and material shown in position before the first step in folding the material;

Fig. 9 is a detail Section of part of Fig. 8 showing the first step of folding the material corresponding substantially to the relation of parts in 1; and

Fig. 10 is a similar view showing the position of the parts after the mold members have all been assembled and the material folded therein substantially as in Fig. 3.

Similar numerals of reference indicate corresponding parts in the several views.

The numeral 1 indicates the inner member .of the mold or die, shown in circular blocklike form, 2 indicates a ring of greater diameter than member 1, to fit around the same and 3 indicates an outer ring of greater diameter than ring 2 to fit around the latter. A disk 4 of leather or other suitable material for the U-packing is placed centrally upon member 1, with the marginal portion of the disk protruding beyond said member, as indicated by the dotted lines in Fig. 1. Said disk will be of suitable diameter to produce the desired packing. Mold 1 will be placed upon a suitable support and ring 2 will be placed against the disk outside of member 1 and forced along the outside of said member to fold the material thereover, as illustrated in Figs. 1 and 9. The operation described produces a substantially cupshaped part of the material having an annular wall extending substantially at right angles to the mid-portion 4 and with a skirt-like portion 4 of the material protruding beyond ring 2. An abutment is located against areoperated in an apparatus such my improved mold members for the mid-portion t of disk 4 which abutment in Fig. 2 is shown in the 7 form of a. plate 5 secured against said midy t and may be tightly clamped such as a bolt or screw 6 holes in said plate and disk in member portion of disk by a projection, top'ass through and through registering hole 1 or block 1, whereby the material at P isse-' curely retained and the ring 2 is retained in place, said abutment'or plate serving r'or the neXt'step of the operation. In the form shown in Fig. 2 said parts are reversed in position from that indicated in Fig. 1 although said reversalfis not necessary and the parts may be retained in'the position in Fig. 1 as illustratedin Figs. "8, 9 and '10. When the mold members are manipulated or'operate'd moreor less by lrandthe skirt portion P of the material'in'ay be pressed outwardly and backward in-the direction of ring 2 to receive the ring 3, as shown in Fig. 3, although when the mold members i i as shown in Figs. 8, 9 and 10 the pressing back of theskirt portion 4? by handis not necessary. Ring 3 is next forced against the skirt portion 4; 'aroundring 2 to fold the portion 1 reversely along and around thei'exterior of said ring, the material bein folded against the edge 2 of'ring 2 substantially as shown in Figs. 3"and 10, whereby the material is folded in s'o-called U-shape in annular form with the walls spaced concentrically outside ofthe central portion 4 I In Figs. '8, 9 and 10 I have illustrated a press or apparatus particularly adapted with forming U- p-acking in an expeditious manner. In said figures a cylinder 7 is secured to or formed with a suitable base 8, the open end of the cylinder slidably receiving a plunger or piston 9 'sho n haying ahead or tabl'e like portion 9 upon which ring 3 is rested. Con,- centrically within'said cylinder is secured a stem orrest lOthat extends'be'yond-the open end of the cylinder and 'slidabl'y receives the bore 9 ofplun'geror piston 9 whereby the latter may travel within the cylinder and along said stem. Mold member 1 is adapted to rest upon stem 10 concentrically with ring 3, said stem serving as an abutment iorm'ember 1. r A pin or projection 11 secured concentrically to. and projecting from stem 10 is adapted to 'receivefthe hole 1 of -mold member 1 to retain the latter concentrically on th'estem. Said projection may be passed through the hole in disk 4* -concentrically with hole 1 otmeniber 1 to retain the material 4 cencentrically on said member. When the parts are assembled as in Fig. '8 the ring 2 will be placed upon the disk of niateri'al 4 in position to be pushed toward mold member 1 to fold the material 4; tlier'earound, asbe'f'ore explained. Tlieabutmentor plate 5 opposes'rirrg'2 on rod opposes at latter such as water, oroll. may be forced under pressure into piston 12 is shown provided with a rod 16 V guided through stufiing box 17 on cross head 14. A spring 18 coiled around said one end a stop 19 on the cross head and at theotherend opposes stop 20 on rod 16, whereby said spring normally tends to draw the plunger or piston 12 into cylinder 13 thereby to raise the abutment or plate 5. The plunger'or pisto'n9 is shown provided with packing in cylinder .7, the having an inletat 22 whereby fluid the cylinder to push the The weight of the piston or plunger.

lssuch as-to' displace'said flu d when plunger the valve controlling the same is opened to permit the descent of the plunger. Plunger or piston 12 is provided with packing'23 and cylinde'r13 has an inlet-2e for said fluid whereby the latter under pressure may force the plunger with abutment 5 downwardly, the valve controlling the fluid being opened during escape of thefluid'from cylinder 13, the spring 18 exerting itspressure to raise'the plunger 12 to lift the abutment 5 and cause discharge otthe fluid from the cylinder. The means for providing hydraulic pressure and valves'ifor controlling the flow to and from the cylinders 7 and 13 may be of any well known or suitable con struction used forhydraulic pressure work.

The upper surface of the head ortable 9 may be provided with concentric lines as a guide for placing mold ri'ng'3 in proper separated, as illustrated in Fig. 8. Fluid pressure is first admitted to'cylinder 13 to force plunger 12 "and abutment 5 down upon ring 2 to cause said ring to fold the disk of material 1 around'meinber 1 in the manner previously described, substantially as shown n 'trudin'g from ring 2. Pressure is maintained in cylinder 13 to resist the next op- F 9, providing the skirt portion '4" proeration and fluid pressure is admitted to cylinder 7 to 'force plunger 9 with ring 3 upwardly so thatsaidring will be pushed against the'skirt portion 4 10f material-4. to

fold the latter around ring 2, as' illustrated in Figs. Sand 10. Aiter'the material i has been folded as stated the fluid pressure in the cylinders willbe released, the plungers will move backfand-the mold parts with the folded material may be removed from the apparatus. The operations will be repeated for each U-packing.

In case the material 4, such as leather, shall have been soaked in water, oil or other liquid, it is preferable to allow the material to dry with the'mold parts assembled thereon, as in Figs. 3 and 10. When the mold parts have been removed from the folded material the central portion 4 will be cut away producing a U-shaped ring, and the edges of the walls of said ring will be trimmed to suit requirements, resulting in the completed U-packing in ring-like form as shown in Fig. 6.

The material is not merely stretched to fold it over the edge of mold member 1, nor to fold it over the edge 2 of ring 2, since in both instances the extended portion of the material is free, and at the folded part 4 the material is folded over the edge 2 of ring 2 without being crowded or stretched whereby in the finished product the packing may be thicker at 4 than along the side walls in case slight stretching of such walls may have occurred. An advantage of my invention is that the leather required for making the packing need be of no greater thickness than that called for in the finished product. The parts of the packing exposed to wear having been compressed and hardened in forming the packing results in increased life and utility thereof since the material is not cracked nor torn while being folded and danger of leakage past the packing in use is lessened.

With the three-part mold described, any desired inside diameter of one part may be used with any outside diameter of another part, and the inner ring 2 is the only one requiring change for producing two different packings having the same inside diameter and different outside diameter or different thickness of leather or other material. The parts of the mold may be made of any desired material, such as brass, cast or wrought iron or steel, or'any desired combination of the same, or one or more of the parts may be made of suitable wood.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

1. A mold for forming U-packing comprising an inner member and two separate concentric rings of different diameter to fit one within another with a space therebetween, both rings being of greater diameter than said member to receive folded material respectively between the member and inner ring and between the two rings, an abutment adapted to oppose said member and the inner ring, and means to detachably apply said abutment to said member with the material therebetween.

2. A mold for forming U-packing com prising an inner member and two separate concentric rings of different diameter to fit one within another with a space therebetween, both rings being of greater diameter than said member to receive folded material respectively between the member and the inner ring and between the two rings, an abutment to oppose said member, said member and abutment having coinciding holes, and a projection operative in said holes toretain said plate and said member with the material therebetween.

3. The combination of an inner member, two separate concentric rings of diiferent diameter to fit one within another around said member with spaces respectively therebetween, an abutment for said member, a movable rest for one of the rings, a movable abutment spaced from the last named abutment to operate the other ring, and means to move said rest and abutment toward one another to cause said rings and member to fold a piece of material therebetween.

4. The combination of an inner member, two separate concentric rings of different diameter to fit one within another around said member with spaces respectively therebetween, a support for said member, a plunger concentric with the support, said plunger be ing adapted to support one of said rings, a plunger spaced from said support to actuate the other ring, said plungers being arranged to move said rings relatively to said member to fold a piece of material between said mem-- ber and rings.

5. The combination of an inner member, two separate concentric rings of different diameter to fit one within another around said member with spaces respectively therebetween, a cylinder, a plunger slidable therein and having a bore, a stem supported concentrically within the cylinder and bore adapted to support said member, a second cylinder spaced from the first named cylinder, and a plunger in the second named cylinder provided with an abutment portion whereby said plungers may move said rings around said member to fold material in U- form therebetween.

6. The combination of an inner member, two separate concentric rings of different di ameter to fit one within another around said member with spaces respectively therebetween, a cylinder, a plunger slidable therein and having a bore, a stem supported concentrically within the cylinder and bore adapted to support said member, a second cylinder spaced from the the first named cylinder, a plunger in the second named cylinder provided with an abutment portion whereby said plungers may move said rings around said member to fold material in U- form therebetween, and a spring connected with the second named plunger to retract it.

7. The combination of an inner member,

two "*separate concentric rings of different diameter to fit one Within another around said member Withspaces respectivlytherebetween, a cylinder, a plnnger'slidabletherein and having a bore, a stem supported concentrically Within the cylinder and bore adapted to Support said member, a second cylinder spaced from the first named cylinder, a plunger in the second named cylin- 1'0 der provided with an abutment portion of February,

'whereby said plungers may move saidrings around said member to folcl'materral 1n U- form therebetween, said stem'haying a pro- Signed at New York in the county of KingsanclState OfVNGW York this 7th day THOMAS OROSSETT. 

